Feeling and emotion are interconnected. You express emotions when you feel something.

If you love someone you feel the love passing through your body, and hence you feel positive and speak good to people. Hence, Love is this case is a positive feeling.

However when you have broken up, you can still feel positive, but deep inside you are sad that you lost someone or someone has betrayed you. You no longer speak positive to people as you constantly think of the girl and that effects everything. You feel disappointed and depressed

Hence feeling and emotion are interconnected and go hand in hand with what happens in each others life.